package com.hmdp.service.impl;

import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.mapper.ShopMapper;
import com.hmdp.service.IShopService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.CacheClient;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RedisData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopServiceImpl extends ServiceImpl<ShopMapper, Shop> implements IShopService {

    /**
     * 测试用
     */

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private CacheClient cacheClient;
    @Override
    public Result queryById(Long id) {
//        缓存穿透
          Shop shop =cacheClient.queryWithPassThrough(CACHE_SHOP_KEY,id,Shop.class,this::getById,CACHE_SHOP_TTL,TimeUnit.MINUTES);
//        Shop shop =cacheClient.queryWithLogicalExpire(CACHE_SHOP_KEY,id,Shop.class,this::getById,CACHE_SHOP_TTL,TimeUnit.MINUTES);
//        Shop shop=shopService.getById(id);
        if (shop==null){
            return Result.fail("店铺不存在");
        }
        return Result.ok(shop);
    }
//
//    public Shop queryWithMutex(Long id)  {
//        String key = CACHE_SHOP_KEY + id;
//        // 1、从redis中查询商铺缓存
//        String shopJson = stringRedisTemplate.opsForValue().get("key");
//        // 2、判断是否存在
//        if (StrUtil.isNotBlank(shopJson)) {
//            // 存在,直接返回
//            return JSONUtil.toBean(shopJson, Shop.class);
//        }
//        //判断命中的值是否是空值
//        if (shopJson != null) {
//            //返回一个错误信息
//            return null;
//        }
//        // 4.实现缓存重构
//        //4.1 获取互斥锁
//        String lockKey = "lock:shop:" + id;
//        Shop shop = null;
//        try {
//            boolean isLock = cacheClient.tryLock(lockKey);
//            // 4.2 判断否获取成功
//            if(!isLock){
//                //4.3 失败，则休眠重试
//                Thread.sleep(50);
//                return queryWithMutex(id);
//            }
//            //4.4 成功，根据id查询数据库
//            shop = getById(id);
//            // 5.不存在，返回错误
//            if(shop == null){
//                //将空值写入redis
//                stringRedisTemplate.opsForValue().set(key,"",CACHE_NULL_TTL,TimeUnit.MINUTES);
//                //返回错误信息
//                return null;
//            }
//            //6.写入redis
//            stringRedisTemplate.opsForValue().set(key,JSONUtil.toJsonStr(shop),CACHE_NULL_TTL,TimeUnit.MINUTES);
//
//        }catch (Exception e){
//            throw new RuntimeException(e);
//        }
//        finally {
//            //7.释放互斥锁
//            unlock(lockKey);
//        }
//        return shop;
//    }


    @Override
    @Transactional
    public Result update(Shop shop) {
        Long id = shop.getId();
        if (id==null){
            Result.fail("店铺id不能为空");
        }
//        更新数据库
        updateById(shop);
//        删除缓存
        stringRedisTemplate.delete(CACHE_SHOP_KEY+id);
        return Result.ok();
    }
}
